Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 28 | // Flags: --harmony-proxies --harmony-reflect |
| 29 | |
| 30 | |
| 31 | |
| 32 | /////////////////////////////////////////////////////////////////////////////// |
| 33 | // JSON.stringify |
| 34 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 35 | |
| 36 | function testStringify(expected, object) { |
| 37 | // Test fast case that bails out to slow case. |
| 38 | assertEquals(expected, JSON.stringify(object)); |
| 39 | // Test slow case. |
| 40 | assertEquals(expected, JSON.stringify(object, undefined, 0)); |
| 41 | } |
| 42 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 43 | |
| 44 | // Test serializing a proxy, a function proxy, and objects that contain them. |
| 45 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 46 | var handler1 = { |
| 47 | get: function(target, name) { |
| 48 | return name.toUpperCase(); |
| 49 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 50 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 51 | return ['a', 'b', 'c']; |
| 52 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 53 | getOwnPropertyDescriptor: function() { |
| 54 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 55 | } |
| 56 | } |
| 57 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 58 | var proxy1 = new Proxy({}, handler1); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 59 | testStringify('{"a":"A","b":"B","c":"C"}', proxy1); |
| 60 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 61 | var proxy_fun = new Proxy(() => {}, handler1); |
| 62 | assertTrue(typeof(proxy_fun) === 'function'); |
| 63 | testStringify(undefined, proxy_fun); |
| 64 | testStringify('[1,null]', [1, proxy_fun]); |
| 65 | |
| 66 | handler1.apply = function() { return 666; }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 67 | testStringify(undefined, proxy_fun); |
| 68 | testStringify('[1,null]', [1, proxy_fun]); |
| 69 | |
| 70 | var parent1a = { b: proxy1 }; |
| 71 | testStringify('{"b":{"a":"A","b":"B","c":"C"}}', parent1a); |
| 72 | |
| 73 | var parent1b = { a: 123, b: proxy1, c: true }; |
| 74 | testStringify('{"a":123,"b":{"a":"A","b":"B","c":"C"},"c":true}', parent1b); |
| 75 | |
| 76 | var parent1c = [123, proxy1, true]; |
| 77 | testStringify('[123,{"a":"A","b":"B","c":"C"},true]', parent1c); |
| 78 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 79 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 80 | // Proxy with side effect. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 81 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 82 | var handler2 = { |
| 83 | get: function(target, name) { |
| 84 | delete parent2.c; |
| 85 | return name.toUpperCase(); |
| 86 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 87 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 88 | return ['a', 'b', 'c']; |
| 89 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 90 | getOwnPropertyDescriptor: function() { |
| 91 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 92 | } |
| 93 | } |
| 94 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 95 | var proxy2 = new Proxy({}, handler2); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 96 | var parent2 = { a: "delete", b: proxy2, c: "remove" }; |
| 97 | var expected2 = '{"a":"delete","b":{"a":"A","b":"B","c":"C"}}'; |
| 98 | assertEquals(expected2, JSON.stringify(parent2)); |
| 99 | parent2.c = "remove"; // Revert side effect. |
| 100 | assertEquals(expected2, JSON.stringify(parent2, undefined, 0)); |
| 101 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 102 | |
| 103 | // Proxy with a get function that uses the receiver argument. |
| 104 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 105 | var handler3 = { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 106 | get: function(target, name, receiver) { |
| 107 | if (name == 'valueOf' || name === Symbol.toPrimitive) { |
| 108 | return function() { return "proxy" }; |
| 109 | }; |
| 110 | if (typeof name !== 'symbol') return name + "(" + receiver + ")"; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 111 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 112 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 113 | return ['a', 'b', 'c']; |
| 114 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 115 | getOwnPropertyDescriptor: function() { |
| 116 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 117 | } |
| 118 | } |
| 119 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 120 | var proxy3 = new Proxy({}, handler3); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 121 | var parent3 = { x: 123, y: proxy3 } |
| 122 | testStringify('{"x":123,"y":{"a":"a(proxy)","b":"b(proxy)","c":"c(proxy)"}}', |
| 123 | parent3); |
| 124 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 125 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 126 | // Empty proxy. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 127 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 128 | var handler4 = { |
| 129 | get: function(target, name) { |
| 130 | return 0; |
| 131 | }, |
| 132 | enumerate: function(target) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 133 | return [][Symbol.iterator](); |
| 134 | }, |
| 135 | has: function() { |
| 136 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 137 | }, |
| 138 | getOwnPropertyDescriptor: function(target, name) { |
| 139 | return { enumerable: false }; |
| 140 | } |
| 141 | } |
| 142 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 143 | var proxy4 = new Proxy({}, handler4); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 144 | testStringify('{}', proxy4); |
| 145 | testStringify('{"a":{}}', { a: proxy4 }); |
| 146 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 147 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 148 | // Proxy that provides a toJSON function that uses this. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 149 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 150 | var handler5 = { |
| 151 | get: function(target, name) { |
| 152 | if (name == 'z') return 97000; |
| 153 | return function(key) { return key.charCodeAt(0) + this.z; }; |
| 154 | }, |
| 155 | enumerate: function(target) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 156 | return ['toJSON', 'z'][Symbol.iterator](); |
| 157 | }, |
| 158 | has: function() { |
| 159 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 160 | }, |
| 161 | getOwnPropertyDescriptor: function(target, name) { |
| 162 | return { enumerable: true }; |
| 163 | } |
| 164 | } |
| 165 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 166 | var proxy5 = new Proxy({}, handler5); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 167 | testStringify('{"a":97097}', { a: proxy5 }); |
| 168 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 169 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 170 | // Proxy that provides a toJSON function that returns undefined. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 171 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 172 | var handler6 = { |
| 173 | get: function(target, name) { |
| 174 | return function(key) { return undefined; }; |
| 175 | }, |
| 176 | enumerate: function(target) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 177 | return ['toJSON'][Symbol.iterator](); |
| 178 | }, |
| 179 | has: function() { |
| 180 | return true; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 181 | }, |
| 182 | getOwnPropertyDescriptor: function(target, name) { |
| 183 | return { enumerable: true }; |
| 184 | } |
| 185 | } |
| 186 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 187 | var proxy6 = new Proxy({}, handler6); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 188 | testStringify('[1,null,true]', [1, proxy6, true]); |
| 189 | testStringify('{"a":1,"c":true}', {a: 1, b: proxy6, c: true}); |
| 190 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 191 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 192 | // Object containing a proxy that changes the parent's properties. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 193 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 194 | var handler7 = { |
| 195 | get: function(target, name) { |
| 196 | delete parent7.a; |
| 197 | delete parent7.c; |
| 198 | parent7.e = "5"; |
| 199 | return name.toUpperCase(); |
| 200 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 201 | ownKeys: function() { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 202 | return ['a', 'b', 'c']; |
| 203 | }, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 204 | getOwnPropertyDescriptor: function() { |
| 205 | return { enumerable: true, configurable: true }; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 206 | } |
| 207 | } |
| 208 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 209 | var proxy7 = new Proxy({}, handler7); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 210 | var parent7 = { a: "1", b: proxy7, c: "3", d: "4" }; |
| 211 | assertEquals('{"a":"1","b":{"a":"A","b":"B","c":"C"},"d":"4"}', |
| 212 | JSON.stringify(parent7)); |
| 213 | assertEquals('{"b":{"a":"A","b":"B","c":"C"},"d":"4","e":"5"}', |
| 214 | JSON.stringify(parent7)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 215 | |
| 216 | |
| 217 | // (Proxy handler to log trap calls) |
| 218 | |
| 219 | var log = []; |
| 220 | var logger = {}; |
| 221 | var handler = new Proxy({}, logger); |
| 222 | |
| 223 | logger.get = function(t, trap, r) { |
| 224 | return function() { |
| 225 | log.push([trap, ...arguments]); |
| 226 | return Reflect[trap](...arguments); |
| 227 | } |
| 228 | }; |
| 229 | |
| 230 | |
| 231 | // Object is a callable proxy |
| 232 | |
| 233 | log.length = 0; |
| 234 | var target = () => 42; |
| 235 | var proxy = new Proxy(target, handler); |
| 236 | assertTrue(typeof proxy === 'function'); |
| 237 | |
| 238 | assertEquals(undefined, JSON.stringify(proxy)); |
| 239 | assertEquals(1, log.length) |
| 240 | for (var i in log) assertSame(target, log[i][1]); |
| 241 | |
| 242 | assertEquals(["get", target, "toJSON", proxy], log[0]); |
| 243 | |
| 244 | |
| 245 | // Object is a non-callable non-arraylike proxy |
| 246 | |
| 247 | log.length = 0; |
| 248 | var target = {foo: 42} |
| 249 | var proxy = new Proxy(target, handler); |
| 250 | assertFalse(Array.isArray(proxy)); |
| 251 | |
| 252 | assertEquals('{"foo":42}', JSON.stringify(proxy)); |
| 253 | assertEquals(4, log.length) |
| 254 | for (var i in log) assertSame(target, log[i][1]); |
| 255 | |
| 256 | assertEquals( |
| 257 | ["get", target, "toJSON", proxy], log[0]); |
| 258 | assertEquals( |
| 259 | ["ownKeys", target], log[1]); // EnumerableOwnNames |
| 260 | assertEquals( |
| 261 | ["getOwnPropertyDescriptor", target, "foo"], log[2]); // EnumerableOwnNames |
| 262 | assertEquals( |
| 263 | ["get", target, "foo", proxy], log[3]); |
| 264 | |
| 265 | |
| 266 | // Object is an arraylike proxy |
| 267 | |
| 268 | log.length = 0; |
| 269 | var target = [42]; |
| 270 | var proxy = new Proxy(target, handler); |
| 271 | assertTrue(Array.isArray(proxy)); |
| 272 | |
| 273 | assertEquals('[42]', JSON.stringify(proxy)); |
| 274 | assertEquals(3, log.length) |
| 275 | for (var i in log) assertSame(target, log[i][1]); |
| 276 | |
| 277 | assertEquals(["get", target, "toJSON", proxy], log[0]); |
| 278 | assertEquals(["get", target, "length", proxy], log[1]); |
| 279 | assertEquals(["get", target, "0", proxy], log[2]); |
| 280 | |
| 281 | |
| 282 | // Replacer is a callable proxy |
| 283 | |
| 284 | log.length = 0; |
| 285 | var object = {0: "foo", 1: 666}; |
| 286 | var target = (key, val) => key == "1" ? val + 42 : val; |
| 287 | var proxy = new Proxy(target, handler); |
| 288 | assertTrue(typeof proxy === 'function'); |
| 289 | |
| 290 | assertEquals('{"0":"foo","1":708}', JSON.stringify(object, proxy)); |
| 291 | assertEquals(3, log.length) |
| 292 | for (var i in log) assertSame(target, log[i][1]); |
| 293 | |
| 294 | assertEquals(4, log[0].length) |
| 295 | assertEquals("apply", log[0][0]); |
| 296 | assertEquals("", log[0][3][0]); |
| 297 | assertEquals({0: "foo", 1: 666}, log[0][3][1]); |
| 298 | assertEquals(4, log[1].length) |
| 299 | assertEquals("apply", log[1][0]); |
| 300 | assertEquals(["0", "foo"], log[1][3]); |
| 301 | assertEquals(4, log[2].length) |
| 302 | assertEquals("apply", log[2][0]); |
| 303 | assertEquals(["1", 666], log[2][3]); |
| 304 | |
| 305 | |
| 306 | // Replacer is an arraylike proxy |
| 307 | |
| 308 | log.length = 0; |
| 309 | var object = {0: "foo", 1: 666}; |
| 310 | var target = [0]; |
| 311 | var proxy = new Proxy(target, handler); |
| 312 | assertTrue(Array.isArray(proxy)); |
| 313 | |
| 314 | assertEquals('{"0":"foo"}', JSON.stringify(object, proxy)); |
| 315 | assertEquals(2, log.length) |
| 316 | for (var i in log) assertSame(target, log[i][1]); |
| 317 | |
| 318 | assertEquals(["get", target, "length", proxy], log[0]); |
| 319 | assertEquals(["get", target, "0", proxy], log[1]); |
| 320 | |
| 321 | |
| 322 | // Replacer is an arraylike proxy and object is an array |
| 323 | |
| 324 | log.length = 0; |
| 325 | var object = ["foo", 42]; |
| 326 | var target = [0]; |
| 327 | var proxy = new Proxy(target, handler); |
| 328 | assertTrue(Array.isArray(proxy)); |
| 329 | |
| 330 | assertEquals('["foo",42]', JSON.stringify(object, proxy)); |
| 331 | assertEquals(2, log.length); |
| 332 | for (var i in log) assertSame(target, log[i][1]); |
| 333 | |
| 334 | assertEquals(["get", target, "length", proxy], log[0]); |
| 335 | assertEquals(["get", target, "0", proxy], log[1]); |
| 336 | |
| 337 | |
| 338 | // Replacer is an arraylike proxy with a non-trivial length |
| 339 | |
| 340 | var getTrap = function(t, key) { |
| 341 | if (key === "length") return {[Symbol.toPrimitive]() {return 42}}; |
| 342 | if (key === "41") return "foo"; |
| 343 | if (key === "42") return "bar"; |
| 344 | }; |
| 345 | var target = []; |
| 346 | var proxy = new Proxy(target, {get: getTrap}); |
| 347 | assertTrue(Array.isArray(proxy)); |
| 348 | var object = {foo: true, bar: 666}; |
| 349 | assertEquals('{"foo":true}', JSON.stringify(object, proxy)); |
| 350 | |
| 351 | |
| 352 | // Replacer is an arraylike proxy with a bogus length |
| 353 | |
| 354 | var getTrap = function(t, key) { |
| 355 | if (key === "length") return Symbol(); |
| 356 | if (key === "41") return "foo"; |
| 357 | if (key === "42") return "bar"; |
| 358 | }; |
| 359 | var target = []; |
| 360 | var proxy = new Proxy(target, {get: getTrap}); |
| 361 | assertTrue(Array.isArray(proxy)); |
| 362 | var object = {foo: true, bar: 666}; |
| 363 | assertThrows(() => JSON.stringify(object, proxy), TypeError); |
| 364 | |
| 365 | |
| 366 | // Replacer returns a non-callable non-arraylike proxy |
| 367 | |
| 368 | log.length = 0; |
| 369 | var object = ["foo", 42]; |
| 370 | var target = {baz: 5}; |
| 371 | var proxy = new Proxy(target, handler); |
| 372 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 373 | |
| 374 | assertEquals('["foo",{"baz":5}]', JSON.stringify(object, replacer)); |
| 375 | assertEquals(3, log.length); |
| 376 | for (var i in log) assertSame(target, log[i][1]); |
| 377 | |
| 378 | assertEquals(["ownKeys", target], log[0]); |
| 379 | assertEquals(["getOwnPropertyDescriptor", target, "baz"], log[1]); |
| 380 | |
| 381 | |
| 382 | // Replacer returns an arraylike proxy |
| 383 | |
| 384 | log.length = 0; |
| 385 | var object = ["foo", 42]; |
| 386 | var target = ["bar"]; |
| 387 | var proxy = new Proxy(target, handler); |
| 388 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 389 | |
| 390 | assertEquals('["foo",["bar"]]', JSON.stringify(object, replacer)); |
| 391 | assertEquals(2, log.length); |
| 392 | for (var i in log) assertSame(target, log[i][1]); |
| 393 | |
| 394 | assertEquals(["get", target, "length", proxy], log[0]); |
| 395 | assertEquals(["get", target, "0", proxy], log[1]); |
| 396 | |
| 397 | |
| 398 | // Replacer returns an arraylike proxy with a non-trivial length |
| 399 | |
| 400 | var getTrap = function(t, key) { |
| 401 | if (key === "length") return {[Symbol.toPrimitive]() {return 3}}; |
| 402 | if (key === "2") return "baz"; |
| 403 | if (key === "3") return "bar"; |
| 404 | }; |
| 405 | var target = []; |
| 406 | var proxy = new Proxy(target, {get: getTrap}); |
| 407 | var replacer = (key, val) => key === "goo" ? proxy : val; |
| 408 | var object = {foo: true, goo: false}; |
| 409 | assertEquals('{"foo":true,"goo":[null,null,"baz"]}', |
| 410 | JSON.stringify(object, replacer)); |
| 411 | |
| 412 | |
| 413 | // Replacer returns an arraylike proxy with a bogus length |
| 414 | |
| 415 | var getTrap = function(t, key) { |
| 416 | if (key === "length") return Symbol(); |
| 417 | if (key === "2") return "baz"; |
| 418 | if (key === "3") return "bar"; |
| 419 | }; |
| 420 | var target = []; |
| 421 | var proxy = new Proxy(target, {get: getTrap}); |
| 422 | var replacer = (key, val) => key === "goo" ? proxy : val; |
| 423 | var object = {foo: true, goo: false}; |
| 424 | assertThrows(() => JSON.stringify(object, replacer), TypeError); |
| 425 | |
| 426 | |
| 427 | // Replacer returns a callable proxy |
| 428 | |
| 429 | log.length = 0; |
| 430 | var target = () => 666; |
| 431 | var proxy = new Proxy(target, handler); |
| 432 | var replacer = (key, val) => key === "1" ? proxy : val; |
| 433 | |
| 434 | assertEquals('["foo",null]', JSON.stringify(["foo", 42], replacer)); |
| 435 | assertEquals(0, log.length); |
| 436 | |
| 437 | assertEquals('{"0":"foo"}', JSON.stringify({0: "foo", 1: 42}, replacer)); |
| 438 | assertEquals(0, log.length); |
| 439 | |
| 440 | |
| 441 | |
| 442 | /////////////////////////////////////////////////////////////////////////////// |
| 443 | // JSON.parse |
| 444 | |
| 445 | |
| 446 | // Reviver is a callable proxy |
| 447 | |
| 448 | log.length = 0; |
| 449 | var target = () => 42; |
| 450 | var proxy = new Proxy(target, handler); |
| 451 | assertTrue(typeof proxy === "function"); |
| 452 | |
| 453 | assertEquals(42, JSON.parse("[true, false]", proxy)); |
| 454 | assertEquals(3, log.length); |
| 455 | for (var i in log) assertSame(target, log[i][1]); |
| 456 | |
| 457 | assertEquals(4, log[0].length); |
| 458 | assertEquals("apply", log[0][0]); |
| 459 | assertEquals(["0", true], log[0][3]); |
| 460 | assertEquals(4, log[1].length); |
| 461 | assertEquals("apply", log[1][0]); |
| 462 | assertEquals(["1", false], log[1][3]); |
| 463 | assertEquals(4, log[2].length); |
| 464 | assertEquals("apply", log[2][0]); |
| 465 | assertEquals(["", [42, 42]], log[2][3]); |
| 466 | |
| 467 | |
| 468 | // Reviver plants a non-arraylike proxy into a yet-to-be-visited property |
| 469 | |
| 470 | log.length = 0; |
| 471 | var target = {baz: 42}; |
| 472 | var proxy = new Proxy(target, handler); |
| 473 | var reviver = function(p, v) { |
| 474 | if (p === "baz") return 5; |
| 475 | if (p === "foo") this.bar = proxy; |
| 476 | return v; |
| 477 | } |
| 478 | |
| 479 | assertEquals({foo: 0, bar: proxy}, JSON.parse('{"foo":0,"bar":1}', reviver)); |
| 480 | assertEquals(4, log.length); |
| 481 | for (var i in log) assertSame(target, log[i][1]); |
| 482 | |
| 483 | assertEquals(["ownKeys", target], log[0]); |
| 484 | assertEquals(["getOwnPropertyDescriptor", target, "baz"], log[1]); |
| 485 | assertEquals(["get", target, "baz", proxy], log[2]); |
| 486 | assertEquals(["defineProperty", target, "baz", |
| 487 | {value: 5, configurable: true, writable: true, enumerable: true}], log[3]); |
| 488 | |
| 489 | |
| 490 | // Reviver plants an arraylike proxy into a yet-to-be-visited property |
| 491 | |
| 492 | log.length = 0; |
| 493 | var target = [42]; |
| 494 | var proxy = new Proxy(target, handler); |
| 495 | assertTrue(Array.isArray(proxy)); |
| 496 | var reviver = function(p, v) { |
| 497 | if (p === "0") return undefined; |
| 498 | if (p === "foo") this.bar = proxy; |
| 499 | return v; |
| 500 | } |
| 501 | |
| 502 | var result = JSON.parse('{"foo":0,"bar":1}', reviver); |
| 503 | assertEquals({foo: 0, bar: proxy}, result); |
| 504 | assertSame(result.bar, proxy); |
| 505 | assertEquals(3, log.length); |
| 506 | for (var i in log) assertSame(target, log[i][1]); |
| 507 | |
| 508 | assertEquals(["get", target, "length", proxy], log[0]); |
| 509 | assertEquals(["get", target, "0", proxy], log[1]); |
| 510 | assertEquals(["deleteProperty", target, "0"], log[2]); |